Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ebcd8d00e3e790b…

MALICIOUS

PDF

56.7 KB Created: 2020-09-09 01:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2203b81aace64e846ca1e207df9007a SHA-1: 52afb89896b5b883e11a43d76f1e0e371d60ade3 SHA-256: 6ebcd8d00e3e790b2287b720c6fbdd814a9ffa275b1cfc936432f2c1d5317f93
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://ttraff.club/wix?keyword=acta+neuropathologica+guidelines', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other PDF links, indicating an attempt to direct users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.club/wix?keyword=acta+neuropathologica+guidelines
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/9b7d8a_2c328a53c8054a6d96d9b9c039785ec6.pdf
    • https://static.usrfiles.com/ugd/a0d21a_ed475f7fb62a4b159fbfa69d374c1c13.pdf
    • https://static.usrfiles.com/ugd/b65acf_971753a08c1040e19f0e554580ccd428.pdf
    • https://static.usrfiles.com/ugd/ae15ca_58731af51bf746d8a3049cca86759841.pdf
    • https://cdn.shopify.com/s/files/1/0437/1811/5480/files/kanawaxesunipep.pdf
    • https://cdn.shopify.com/s/files/1/0436/8036/6745/files/roxezolab.pdf
    • https://cdn.shopify.com/s/files/1/0428/1961/6935/files/baidu_browser_for_macbook.pdf
    • https://cdn.shopify.com/s/files/1/0437/7221/5448/files/set_background_color_button_android_xml.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/39418447982.pdf
    • https://cdn.shopify.com/s/files/1/0429/7962/3071/files/god_s_not_dead_3_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/2545/7574/files/noxogina.pdf
    • https://cdn.shopify.com/s/files/1/0434/3303/3877/files/sejifoxotenimo.pdf
    • https://cdn.shopify.com/s/files/1/0457/8652/9948/files/printable_blank_weekly_schedule_template.pdf
    • https://static.usrfiles.com/ugd/badafb_4c35ee24f6184f51867c2746c147a291.pdf
    • https://static.usrfiles.com/ugd/b8c837_00d660db7dc74301b8966681077a6c88.pdf
    • https://static.usrfiles.com/ugd/c068f8_706b9212b71b48e49362899077751281.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ae9e16d59ed47b1b9ebd420543c6745.pdf
    • https://static.usrfiles.com/ugd/b1b16e_8382f3cc5dde46e9a78b5dd75d7e2a0a.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007647.bin
2b5f0bc8b9edc3a4ad9e4734c8ae19c9806f084cb9b43501bedf67f90ad75629		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7647 6416 bytes
font_01_sfnt_off00008c09.bin
eae10e8e43fd740c455b2969a91b2113202c7149af19cbd2e2b15ae555701b9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C09 5208 bytes
font_02_sfnt_off00009da7.bin
1829a2bb5f7c336955bcd4986aadaad031d6e002603a1f37f70267fae52b4651		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DA7 12536 bytes
font_03_sfnt_off0000c6a2.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A2 4324 bytes

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